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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e088d748245764c6c972b9ef84d63c6f637a30eeceacf3f80eeed33a5254de2' 
  AND token = 'qpkSSAMDict6V0YQMnUH9U8/whOUoCB4ZZMeY4vvcWQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}